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/* Detect directed cycle and print one if found */
BEG_G{
node_t tp, hp;
node_t stk[node_t];
$tvtype = TV_prepostfwd;
$tvroot = fstnode($);
}
N {
if (stk[$]) {
stk[$] = NULL;
}
else if ($tvedge == NULL) { /* current root */
stk[$] = $;
}
else {
stk[$] = $tvedge.tail;
}
}
E {
if (stk[$.head]) {
tp = $.tail;
hp = $.head;
while (tp != $.head) {
printf ("%s -> %s\n", tp.name, hp.name);
hp = tp;
tp = stk[tp];
}
printf ("%s -> %s\n", tp.name, hp.name);
exit(0);
}
}